package com.kuang.config;

import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

/**
 *
 */
public class MyInterceptor implements HandlerInterceptor {
    /**
     * true 执行下一个拦截器
     * false 不执行下一个拦截器
     */
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        System.out.println("------------处理前------------");

        if (request.getRequestURI().contains("login")) {
            return true;
        }
        HttpSession session = request.getSession();

        // 如果用户已登陆也放行
        if(session.getAttribute("user") != null) {
            return true;
        }
        // 用户没有登陆跳转到登陆页面
        request.getRequestDispatcher("/WEB-INF/jsp/login.jsp").forward(request, response);
        return false;
    }

    // 拦截日志
    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        System.out.println("------------处理后------------");
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        System.out.println("------------清理------------");

    }
}
